(function($){
// jQuery autoGrowInput plugin by James Padolsey
// See related thread: http://stackoverflow.com/questions/931207/is-there-a-jquery-autogrow-plugin-for-text-fields
$.fn.autoGrowInput = function(o) {
o = $.extend({
maxWidth: 1000,
minWidth: 70,
comfortZone: 30
}, o);
this.filter('input:text').each(function(){
var minWidth = o.minWidth || $(this).width(),
val = '',
input = $(this),
testSubject = $('<tester/>').css({
position: 'absolute',
top: -9999,
left: -9999,
width: 'auto',
fontSize: input.css('fontSize'),
fontFamily: input.css('fontFamily'),
fontWeight: input.css('fontWeight'),
letterSpacing: input.css('letterSpacing'),
whiteSpace: 'nowrap'
}),
check = function() {
if (val === (val = input.val())) {return;}
// Enter new content into testSubject
var escaped = val.replace(/&/g, '&amp;').replace(/\s/g,'&nbsp;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
testSubject.html(escaped);
// Calculate new width + whether to change
var testerWidth = testSubject.width(),
newWidth = (testerWidth + o.comfortZone) >= minWidth ? testerWidth + o.comfortZone : minWidth,
currentWidth = input.width(),
isValidWidthChange = (newWidth < currentWidth && newWidth >= minWidth)
|| (newWidth > minWidth && newWidth < o.maxWidth);
// Animate width
if (isValidWidthChange) {
input.width(newWidth);
}
};
testSubject.insertAfter(input);
$(this).bind('keyup keydown blur update', check);
});
return this;
};
})(jQuery);